Telegraph transmitter



A g-25,1931. a. D. SALMON v 1,820,499

TELEGRAPH TRANSMITTER Filed Oct. 5, 1930 Hal.

INVENTOR REGINALD DSALMON av ea M AT TORNIEY release Aug. 25, 1931 i nneriiatn ii-minis SALMOK-OFCROYDdN, ENGLAND; ASSIGNOR T ennui) AND a a .PANY-,LIMITED,'OF GROYDON, ENGLAND .1 I

I i-,sz0,49e a coivr I TELEGRAPH TRANSMITTER.-

' i meafiled October a, lE JSO SerialN 486,128, ah iq i nqrea't B ritain Decemberem, 1 929. I i

This invention relates to keyboard transmitters for telegraph systems employing rotatable type wheel at theireceiving station. The printingapparatus at -thereceiving station in" a stock'ticker system forexample is usually arranged'so that thetype'wheel is normally held stationary by means of an escapement Wheel under the" control of a polarized line relay. The escapement wheel carries teeth equal in number to the char acters on the type wheel; For each complete reversal transmitted by the distant, trans mitter the polarized line relay'is actuated first to one side and then back again, 'releas '15 ingone tooth of the escapement'wheel and so allowing the type wheel to rotate a distance: equal tothat ofone character. In serice with the polarized relay is a slow acting non-polarized relay which is not sensitive to the reversals of signalling frequency, but op-- perates on a steady directcurrent' to. actuate printing mechanism.v -At the transmitting station a commutator is provided havingdouble the number of segments ofthe char acterson the typewheehalternate segments being connected to positive and negative bat- ,terya'nd a brush connected-to the line is arrangedto sweep over and to be held on any one segment according toth'e characterthat' so is requiredtobe printed, the brush'norma'lly resting-on the segment corresponding to the character last selected. The key levers are arrangedto control a series of stops'arranged around the commutator; Each key when depressed releases the commutator brush from its previous positionand allows the brush to rotate until arrested by a stopc'orres'ponding' to the'key depressed.

I It Willthus be seen that a train reversals -4 corresponding in number to the characterson:

the type wheel between the onelastprinted and the one required is sent at each depres. sion of a key, followed-by alsteady current interval. The arrangements to co'ntrolthe rotation 01": the commutator brush from the keyboard in such transmitters may be electrical or mechanical, but a common characteristic feature of suchmetho'ds is that means individual to each key is employed'to connect 150 the'keytothe commutator controlling'means.

sponding to, a particular position thereof, a corresponding plurality of keys, *combina not considered necessary to repeat them here.

Such methods in expensive.

- According to general are cumbersome and the present invention a tele-V graph transmitter comprises, a rotatable member, a plurality of anembers each corretion members lessin number-than said pl'urality of keys and actuated lam-yan com-- binationsto select one, of said plurality of membersfand means actuated by said rotatable member for sending a signalin accordance with-the particularkey depressed. v

The method involved has the great advan 1 V tage that it'permits a form offconstruction utilizing permutation bars, combination I discs and selector bars which are standard parts for printingtelegraphs operating on the start stopprinciple. I 7

Another advantage shown in the present 3 arrangements is that a source of'mechanical power being alreadynecessary in such transmitters toefi'ect rotation ofthe rotatable member, the same source may be utilized to effect the actual movement of the stops'under the control of the key levers. This relayed-Q;

action hasa certain value'in maintaining the touch of the keylevers as light as possible. 'The accompanying drawings Figurcsgl and 2 represent diagrammatically such an arrangement according to the'present invention. Many of the details referred to are shown and explainedat greater length in'the specifications above referred to,: so that it is Allthe elements incorporated in the present invention will be readily comprehended by thoseconversantawithi the. Mt and only the new combination of theseelements forthe purpose outlined above'will be given. I -Key levers A are set above andat right angles to five notched combination bars B1 5 and a universal bar C inthe usual manner, The five combination bars B1-5' are adaptedto be actuated in varying combinations on depression of a key lever. Each actuate'dbar moves to the right wherebyits end intercepts the movement of one of aseries of'se'lector bars Dl5 which are loosely pivotedon the common pivot E. The opposite ends of these selector bars D15 press under the tension of springs on the cam surface of sleeve E situated above such selectorbars Sleeve E is rotatably mounted on a sha c G which is maintained in continuous rotation by a mo tor or other source of mechanical power (not shown) and is clutched to the shaft G for one revolution only at each depression of a key lever A by the actuation of the universal bar 0. A second but stationary shaft I-I carries five independently rotatable notched combination discs J15, each disc having an arm K fixed thereto which engages with the extremity of one of the, selector bars D1"-.5.

Arranged around the notched combination discs J1-5 is a series of springactuated latches L, each pivoted on disc M and ;l)10 V ing in radial slots in suitably arranged llX(l discs, each individual latch L corresponding; to one of the key levers A. A cam groove in the sleeve E actuates a lever N pivoted at O which slides a bush Pon shaft H thereby raising the arms of all the latches L or letting them rest under the tension of individual springs Q on the notched combination discs J1 5. .On the motor driven shaft G isa pinion R driven from shaft G through a yielding friction clutch S. Pinion R meshes with spur wheel U which is rotatably mounted on the fixed shaft H and carries an arm V which revolves clear of the latches L but is arrested by any latch which has been permitted to fall into aligned notches of the combination discs Jl5. A-disc T having a series of V shaped notches equal in number to the latches L, is also fixed so as to rotate with spur wheel U andarm V. A spring pressed movable contact arm X is adapted to be oscillated between positive and negative contact screws by the cam notches 'in the disc whereby one complete reversal is sent to line for each angular space traversed by arm V corresponding to the separation of adjacent latches L.

The operation. is as follows z-lVhen a key lever A is depressed certain of the combination bars B15 are moved longitudinally and intercept the movement of their corresponding selector bars D1-5. The universal bar C causes sleeve E to be clutched to shaft G for one revolution only. During this revolution lever N first actuates bush H and raises all the latches L from the notched combination discs J15. Cam sleeve E then permits all of the selector bars D1-5 simultaneously to rock on pivot E under the tension of their springs. The movementof certain of these bars will be intercepted by the extremity of the combination bars B15 as above mentioned so that no appreciable movement will be communicated to their corresponding discs Jl5, but those bars D15 not intercepted will now rotate their associated discs J15 by arms K through a certain angle. This alines the notches in all of the discs rearrested in the new position.

for one latch L only which is then permitted by the retraction of bush P to fall into a position to arrest arm V. Selector bars D15 are then returned to normal and sleeve E comes to rest. 'The combination discs J15 which have been actuated are held against spring tension by the latch L and pinion R continues to drive spur wheel V, thus sending reversals corresponding in number to the latches L traversed by arm V until arm V is A locking magnet LM in the circuit of contact arm X is adapted to actuate on the direct current which is sent to line during a pause between trains of reversals, thereby unlocking the combination barsiBl efi and permitting a fresh'combination to be set up. The magnet releases however during a train of reversals and locks the combination bars.

The actual details of construction and the arrangement of parts may be variously modified in stock ticker and like telegraphic transmittersemploying a method of control of a, commutator from a keyboard through a small number of intermediate levers actuated in varying combinations. The arrangements as described have the additional advantage of utilizingparts which are also employed in the construction of thetelegraphic apparatus shown in the two above mentioned specifications but it will be understood that the in-- vention as shown by the following claims is not limited to this one particular arrangement.

What is claimed is:

1. A; telegraph transmitter comprising a rotatable member, a plurality of members each corresponding to a particular position thereof, a corresponding plurality of kevs. combination members less in number than said plurality of keys and actuated in varymg combinations to select one of said plurality of members, and means actuated by said rotatable member for sending a sia'nal in accordance with the particular key depressed.

2. A telegraph transmitter comprising a plurality of key levers, a series of combinationbars actuated in accordance with a particular key depressed, a corresponding series ofcombination discs actuated therefrom, a plurality ofmovable members of which one is selected according to the setting of said combination discs and a rotatable member cooperating therewith to send a correspondes s el- 3. A telegraph transmitter comprising a plurality of key levers, a series of combination bars actuated in accordance with a particular key depressed, a correspondingseries of combination discs actuated therefrom. a plurality of movable stop members of which one is selected accordina to the setting of said combination discs, and a rotatable member controlled thereby to send a series of impulses All or reversals in accordance withthe number of stop members traversed;

4. In a telegraph transmitter the combination comprising a rotatable member, a plurality of members each corresponding to a particular position thereof, a corresponding plurality of keys, a series of combination bars less in number than saidplurality of keys, 'a corresponding series of combination discs and to select one of said members a series of lntermediate levers mechanically actuated on depression of one of sald keys to set sa1d discs in accordance with the setting of said bars.

5. In a telegraph transmitter the combination comprising a rotatable member, a plurality of members each corresponding to a cam sleeve for replacing any one of said,

members previously selected. 7

6. A telegraph transmltter comprising a plurality of key levers, a series of combination bars, a corresponding series of combination discs, a plurallty of movable members of which one is selected according to the set-- ting of said discs, levers intermediate said bars and said dlscs, a dr1v1ng shaft, a cam sleeve clutched thereto for 1' revolution on 7 each depression of-a key to raise a previously selected one of said-movable members and to I release said intermediate levers for setting said discs in accordance with the setting of said bars, a pinion yieldingly driven from said driving shaft, a spur wheel meshing with said pinion and carrying a stop which engages with a selected member and contact meansoperated thereby to transmit a series of impulses or reversals in accordance with the number of stop members traversed.

7. In a telegraph transmitter a plurality of key levers, a seriesof combination bars actuated therefrom, afcorresponding series.

of combination discs,a cam sleeve clutched to a driving shaft for 1 revolution on'depression of a key, anda series of 1ntermed1- 7 ate levers released on rotation of said cam sleeve to bear under'spring tension against said bars and sald dlscs at opposite extremities under spring tension so that those levers not interceptedby its combination bar actuates its correspondingcombination disc.

8. A telegraphtransmitter comprising a plurality of key levers,-a series of combination bars actuated in accordance witha particular keydepressed, a corresponding series of combination discs actuated therefrom, a

plurality. of movable members of which oneis selected according, to the setting of said combination discs, a rotatable member cooperating therewith to send a corresponding signal, and means for locking saidcombination bars against movement during the transmission of said signal; I

9. A telegraph transmittercomprising a plurality of key levers, a series of combination barsactuated in accordance with a par- I ticular key, depressed, a corresponding series 7 of combination discs actuated therefrom, a plurality of movable stop members of which one is set accordingto the setting of said I combination discs, a rotatable member controlled thereby to senda series of impulses or reversals in accordance with the number of stop members traversed, and a magnet'deenergized durmg said unpulses or reversals to 'lock'said combination bars against move- I 'ment. I

10. A telegraph transmitter comprising a" plurality of key levers, .a series of combination'bars, a correspondingseries of combi- I i I nation discs, a plurality of movable members i of which one is' selected according to the set ting'of said discs, levers intermediate said bars and said discs, adriving shaft a cam sleeve clutched thereto forl revolution on I each depression of a keyto raise a previously selected one of said movable members andto releasesaid intermediatelevers for setting said discs in accordance with the setting of said bars, a pinion yieldingly driven from said driving shaft, a spur wheel meshing with said pinion and carryinga stop which en gages with a selected member, Contact means I numbers of stop "members traversed and a magnet de-energized during said reversals to lock said combination bars against movement.,

In witness whereof I hereunto subscribe my name this twelfth. day of September, 1930.

REGINALD DENNIS SALMON.

"operated thereby to transmitca series of impulses or reversals in accordance with the 

